/lit/ - Literature

I am incapable of holding a moral or political conversation in which I can explain my ideas in a coherent and convincing way. It's not like I don't have any political or moral stances, whatever the topic of the conversation is, but rather I can't organize a reasonable speech without a preliminary preparation. Furthermore, I have always been an introvert and I have a weird-sounding voice.
What are the best books or classes that will help me improve my conversation skills and my ability to express myself?